Khao Kradong Forest characterizes two small Khao Kradong Mountain and Khao Yai Mountain situated next to each other. In the khao Kradong area is consisting of plain and highland which is sloping down from Khao Kradong and Khao Yai eastward. There are shallow valleys and 2 reservoirs within. In southeastern Khao Kradong, there are Charake Mak Reservoir and Huay Talad Resevior.